JPH044707A - Gas insulation switchgear - Google Patents

Abstract

PURPOSE:To shorten the main bus and improve insulation resistance by arranging a main bus vertically, and horizontally leading out the branch circuit unit consisting of a disconnecting switch, connected to this main bud, a breaker, a CT, a bushing, a cable head, a lightening arrestor, etc. CONSTITUTION:A main bus 1 (phase signal A-C are omitted, and the rest is the same) of three phases is erected vertically, and by a frame 11, a transmission line L consisting of a disconnecting switch 3, a CT4, and a breaker 5 is provided at the second floor, horizontally from the main bus 1 to the outside. Subsequently, it is connected to a transmission line 8 through a lightening arrestor 7 and a bushing 6. Moreover, by a frame 12, a bus dividing unit S consisting of a disconnecting switch 3, a CT4, and a breaker 5 is provided, at the third floor, astride the main bus 1. A transformer unit T is provided at the first floor, and is connected to the transformer outside the figure through a disconnecting switch 3, a CT4, a breaker 5, a cable head 9, and a cable 10. Hereby, the length of the main bus is shortened, and required area is reduced, and minute metallic pieces are accumulated in the low electric field at the bottom of the main bus, whereby internal discharge is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas insulated switchgear used in substations and the like.

[Conventional technology]

Figure 5 shows, for example, Mitsubishi Electric Edafuri, Vol. 51, No. 6, P.
, 379, and the main bus bars (1^), (IB), and (IC) are respectively A.

Main bus line of B and C phases, horizontally arranged (hereinafter, A, B, and C represent phases) 0 turnout &! (2^).

(2B), (2C) are the main bus lines (1^>, (IB)
They are connected at portions i (IC) and m, respectively, and are placed on a plane one step higher than the main bus bar. At the tip of this are a disconnector (3^) (3B), (3C), a current transformer (
4^), (4B), (4C), circuit breaker (5^) (5B
>, (5C) are connected, and the parts shown on the lower left side of the figure are current transformers (4^), (4B), (4C), disconnectors (3^) (3B>, (3C), Bushing (6^),
(6B), (6C), lightning arrester <7A), (7B)
, <7C) are connected. Bushing (6^)
, (6B), (6C) are power transmission lines (8^), (8B),
(8C), this disconnector (3^), (3B)
, (3C) , Current transformer (4^), (4B>, (4C)
, Disconnector (5^), (5B), (5C), Bushing (6^), (6B), (6C), Lightning arrester (7Δ),
A unit consisting of (7B) and (7C) is called a feed line unit, and such a unit is indicated by (L).

On the other hand, the part shown on the upper left side of the figure is the circuit breaker (5^).

(5B), (5C), then current transformer 4^), (4B
), (4C), lightning arrester (7^), (7B),
(7C) Cable head part (9^), (9B) (9
C) is connected, here is the cable (10^), (IOB)
.

(IOC) is connected and a transformer is provided at its tip, so such a unit is called a transformer unit and is designated by (T). In addition, the units shown in the lower center of Fig. 5 are disconnectors (3^), (3B), (3C
), current transformer (4^), (4B), (4C), circuit breaker (5
It consists of ^), (5B), and (5C), and has the role of electrically dividing the main bus bar, and is called a bus bar division unit. Here, it is indicated by (S).

With the above configuration, for example, electricity is sent from the generator at the tip of the transformer connected to the transformer unit (T),
The power is sent to each unit via the main bus (1^), (IB), and (IC), and sent out from the power line unit (L) to the power line. Receives power from (L), main bus (1^), (I
B) In some cases, the power is sent to each transformer unit (T) via the (IC) and used as power receiving equipment.

In addition, in some cases, the main bus (1^), (IB)
(IC) may be operated as an independent circuit by opening the circuit breaker or disconnector of the busbar segmentation unit (S). Furthermore, in the unlikely event of an accident, the circuit breaker opens, isolating the accident point and continuing operation of the healthy parts.

[Problem to be solved by the invention]

Conventional gas insulated switchgear was constructed as described above, requiring a relatively large site area and long main busbars and branch busbars, which increased costs and resulted in long electrical insulation sections. Therefore, there were problems such as an increased probability of failure. In addition, there is a problem in that the dielectric strength is lowered due to minute metal particles mixed in the gas, and the horizontally arranged busbar portion is easily affected by this.

This invention was made to solve the above-mentioned problems, and provides a gas-insulated switchgear that can be installed on a small site, has shorter main busbars and branch busbars, reduces costs, and improves reliability. The purpose is to obtain.

[Means to solve the problem]

In the gas insulated switchgear according to the present invention, the main bus bar is provided vertically, and a branch unit including a disconnector, a circuit breaker, a current transformer, etc. connected to the main bus bar is drawn out from the main bus bar in a horizontal direction.

[For production]

In this invention, it is possible to shorten the length of the bus bar, and since the main bus bar is vertical, metal particles that reduce the gas dielectric strength fall and collect in the low electric field area at the bottom of the main bus bar. be able to.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In the figure, the numbers assigned to each part are the same as in Figure 5, and the main bus line (1^) indicates the main bus line of A phase, and Dotan&l (1^), (IB), and (IC) are vertical. A power transmission line unit (L) is installed on the second floor by a frame (11) so as to extend horizontally outward from the main bus bar. In addition, the main busbar (1^) is located on the third floor with the busbar division unit (S) mounted on the mount (12).

It is provided to straddle <IB> and (Ic).

A transformer unit (T) is provided in the 11M section,
It is connected to a transformer (not shown) by a cable head (9B), cable (IOB>, etc.).

The operation of the gas insulated switchgear with the above configuration is the same as in the case shown in Fig. 5 above.
, (8B> , (8C) and cable (10^),
(IOB).

(IOC), transmits and receives power while switching circuits, and in the event of an accident, isolates the fault point using a circuit breaker.

However, this embodiment has the following special effect.

First, as you can clearly see by comparing Figures 1 and 2 with Figure 5, the main #: lines (1^), (IB), and (IC) have become extremely short, and the branch bus line (2 ^), (2B),
(2C) is no longer necessary. Therefore, the frame m), <
Even if the cost of 12) is required, the cost can be further reduced, the probability of failure is also reduced, and reliability is improved.

Secondly, due to the increase in high-rise buildings, the installation area has become extremely small.
It is reduced to about 175 compared to the one in FIG.

This is extremely advantageous for substations located near cities where land prices are high.

In addition, since the main bus bar is vertical, if a low electric field section is created at the bottom of the main bus bar, minute metal pieces that have a negative effect on gas insulation will be captured there, so there will be no deterioration in insulation performance.
High reliability can be obtained. The low electric field section can be created with a simple structure such as slightly extending the main busbar container downward.

Note that the above embodiments are based on phase-separated main busbars (1^), (IB
), (IC), but as another example, a three-phase-axis type main bus (1) can also be used, as shown in Section 4 of FIG. The plan view on the left half of Fig. 4 shows the second floor part of the one in Fig. 3, and the right half shows the first floor part. It consists of 2 sets and 2 sets of transformer units (T), and the transformer (13) is connected to the connecting parts (14^), (14B),
(14C) gas-oil bushing (15^).

(15B) and (15C) are directly connected. Bushings for each unit (6^)-, (6B), (6C)
However, by arranging each unit device radially from the main bus bar in the center, sufficient distance between bushings can be secured without using extra branch bus bars with a configuration of only the devices. It is possible and economical.

In addition, since gas that rises due to energization gathers at the top of the vertical bus bar, heat dissipation can be improved by providing heat dissipation fins on the upper container, thereby improving the energization ability.

The extraction of each phase separation from this three-phase-disposable busbar is carried out by the fourth
In the figure, if the conductors are pulled out symmetrically along the left and right lines, each phase conductor of the main bus bar can be supported by the branch conductor supported by the two left and right insulators, which is advantageous because strong support can be achieved.

In addition, for the main bus (1) which is integrated into three phases, each device (breaker, disconnector, etc.) of the branch unit may also be of the phase-shaft type to further reduce the size of the device.

According to the above embodiment, the main bus bar (1) is very short and has a simple structure. Therefore, the insulation design of this main bus bar portion can be designed to be one step higher than that of other portions with a slight increase in cost. It is also good to make the insulating spacer (16B) that supports the main bus conductor (17B) and the main bus container (19) a little larger than the other unit parts to have high withstand voltage characteristics.

Further, in some cases, the gas pressure can be made higher than in other parts to improve withstand voltage performance. If an accident were to occur, the main F& line section could cause the entire substation to stop functioning, and since it is located in the center of the equipment and difficult to repair, the main bus bar could be moved to another section. Improving reliability through a higher level of insulation design is an effective means.

In addition, at the bottom of the main bus bar (1), a pole (2o) is provided to allow minute metal pieces to pass through, like a wire mesh, and to capture minute metal pieces that are connected to the container of the main bus bar and grounded. For example, the minute metal pieces inside the bus bar fall between the t-pole (20) and the container wall, and the main bus bar (1) is reliably obtained without floating due to electrostatic force and without deterioration in insulation due to the minute metal pieces.

〔Effect of the invention〕

As described above, according to the present invention, since the main bus bar is placed vertically and each branch unit is arranged horizontally, the main bus bar is shortened, and there is no deterioration of insulation properties due to fine metal powder, resulting in improved reliability. can be improved. Furthermore, the installation area is also reduced, which has great economic effects.

[Brief explanation of drawings]

17 and 2 are a side view and a plan view of an embodiment of the present invention, FIGS. 3 and 4 are a partially sectional side view and a partially sectional plan view of another embodiment, and FIG. 5 is a conventional FIG. 2 is a plan view showing an example of a gas-insulated switchgear. (1), (1^), (IB>, (IC>)
Main bus, (3Δ), (3B) (3C)...disconnector,
(4^) , (4B) , (4C) ・Current transformer, (5Δ) , (5B) , (5C) ・Creator, (6^) , (6B) , (6C) ・Bushing, (7^ ), <7B), <7C)
Snow protector, (9^) (9B), (9C) cable head. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A gas-insulated switchgear in which a main bus bar is installed vertically, and a branch circuit unit consisting of a disconnector, circuit breaker, current transformer, bushing or cable head, lightning arrester, etc. connected to the main bus bar is drawn out horizontally from the main bus bar. Device.